4 * Copyright (C) 1991-1995, Thomas G. Lane.
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5 * This file is part of the Independent JPEG Group's software.
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6 * For conditions of distribution and use, see the accompanying README file.
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8 * This file contains master control logic for the JPEG decompressor.
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9 * These routines are concerned with selecting the modules to be executed
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10 * and with determining the number of passes and the work to be done in each
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14 #define JPEG_INTERNALS
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15 #include "jinclude.h"
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16 #include "radiant_jpeglib.h"
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22 struct jpeg_decomp_master pub; /* public fields */
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24 int pass_number; /* # of passes completed */
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26 boolean using_merged_upsample; /* TRUE if using merged upsample/cconvert */
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28 /* Saved references to initialized quantizer modules,
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29 * in case we need to switch modes.
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31 struct jpeg_color_quantizer * quantizer_1pass;
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32 struct jpeg_color_quantizer * quantizer_2pass;
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35 typedef my_decomp_master * my_master_ptr;
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39 * Determine whether merged upsample/color conversion should be used.
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40 * CRUCIAL: this must match the actual capabilities of jdmerge.c!
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44 use_merged_upsample (j_decompress_ptr cinfo)
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46 #ifdef UPSAMPLE_MERGING_SUPPORTED
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47 /* Merging is the equivalent of plain box-filter upsampling */
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48 if (cinfo->do_fancy_upsampling || cinfo->CCIR601_sampling)
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50 /* jdmerge.c only supports YCC=>RGB color conversion */
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51 if (cinfo->jpeg_color_space != JCS_YCbCr || cinfo->num_components != 3 ||
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52 cinfo->out_color_space != JCS_RGB ||
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53 cinfo->out_color_components != RGB_PIXELSIZE)
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55 /* and it only handles 2h1v or 2h2v sampling ratios */
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56 if (cinfo->comp_info[0].h_samp_factor != 2 ||
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57 cinfo->comp_info[1].h_samp_factor != 1 ||
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58 cinfo->comp_info[2].h_samp_factor != 1 ||
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59 cinfo->comp_info[0].v_samp_factor > 2 ||
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60 cinfo->comp_info[1].v_samp_factor != 1 ||
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61 cinfo->comp_info[2].v_samp_factor != 1)
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63 /* furthermore, it doesn't work if we've scaled the IDCTs differently */
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64 if (cinfo->comp_info[0].DCT_scaled_size != cinfo->min_DCT_scaled_size ||
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65 cinfo->comp_info[1].DCT_scaled_size != cinfo->min_DCT_scaled_size ||
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66 cinfo->comp_info[2].DCT_scaled_size != cinfo->min_DCT_scaled_size)
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68 /* ??? also need to test for upsample-time rescaling, when & if supported */
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69 return TRUE; /* by golly, it'll work... */
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77 * Compute output image dimensions and related values.
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78 * NOTE: this is exported for possible use by application.
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79 * Hence it mustn't do anything that can't be done twice.
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80 * Also note that it may be called before the master module is initialized!
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84 jpeg_calc_output_dimensions (j_decompress_ptr cinfo)
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85 /* Do computations that are needed before master selection phase */
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87 #if 0 // JDC: commented out to remove warning
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89 jpeg_component_info *compptr;
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92 /* Prevent application from calling me at wrong times */
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93 if (cinfo->global_state != DSTATE_READY)
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94 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
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96 #ifdef IDCT_SCALING_SUPPORTED
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98 /* Compute actual output image dimensions and DCT scaling choices. */
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99 if (cinfo->scale_num * 8 <= cinfo->scale_denom) {
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100 /* Provide 1/8 scaling */
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101 cinfo->output_width = (JDIMENSION)
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102 jdiv_round_up((long) cinfo->image_width, 8L);
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103 cinfo->output_height = (JDIMENSION)
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104 jdiv_round_up((long) cinfo->image_height, 8L);
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105 cinfo->min_DCT_scaled_size = 1;
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106 } else if (cinfo->scale_num * 4 <= cinfo->scale_denom) {
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107 /* Provide 1/4 scaling */
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108 cinfo->output_width = (JDIMENSION)
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109 jdiv_round_up((long) cinfo->image_width, 4L);
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110 cinfo->output_height = (JDIMENSION)
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111 jdiv_round_up((long) cinfo->image_height, 4L);
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112 cinfo->min_DCT_scaled_size = 2;
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113 } else if (cinfo->scale_num * 2 <= cinfo->scale_denom) {
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114 /* Provide 1/2 scaling */
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115 cinfo->output_width = (JDIMENSION)
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116 jdiv_round_up((long) cinfo->image_width, 2L);
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117 cinfo->output_height = (JDIMENSION)
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118 jdiv_round_up((long) cinfo->image_height, 2L);
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119 cinfo->min_DCT_scaled_size = 4;
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121 /* Provide 1/1 scaling */
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122 cinfo->output_width = cinfo->image_width;
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123 cinfo->output_height = cinfo->image_height;
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124 cinfo->min_DCT_scaled_size = DCTSIZE;
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126 /* In selecting the actual DCT scaling for each component, we try to
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127 * scale up the chroma components via IDCT scaling rather than upsampling.
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128 * This saves time if the upsampler gets to use 1:1 scaling.
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129 * Note this code assumes that the supported DCT scalings are powers of 2.
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131 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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133 int ssize = cinfo->min_DCT_scaled_size;
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134 while (ssize < DCTSIZE &&
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135 (compptr->h_samp_factor * ssize * 2 <=
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136 cinfo->max_h_samp_factor * cinfo->min_DCT_scaled_size) &&
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137 (compptr->v_samp_factor * ssize * 2 <=
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138 cinfo->max_v_samp_factor * cinfo->min_DCT_scaled_size)) {
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141 compptr->DCT_scaled_size = ssize;
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144 /* Recompute downsampled dimensions of components;
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145 * application needs to know these if using raw downsampled data.
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147 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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149 /* Size in samples, after IDCT scaling */
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150 compptr->downsampled_width = (JDIMENSION)
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151 jdiv_round_up((long) cinfo->image_width *
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152 (long) (compptr->h_samp_factor * compptr->DCT_scaled_size),
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153 (long) (cinfo->max_h_samp_factor * DCTSIZE));
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154 compptr->downsampled_height = (JDIMENSION)
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155 jdiv_round_up((long) cinfo->image_height *
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156 (long) (compptr->v_samp_factor * compptr->DCT_scaled_size),
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157 (long) (cinfo->max_v_samp_factor * DCTSIZE));
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160 #else /* !IDCT_SCALING_SUPPORTED */
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162 /* Hardwire it to "no scaling" */
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163 cinfo->output_width = cinfo->image_width;
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164 cinfo->output_height = cinfo->image_height;
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165 /* jdinput.c has already initialized DCT_scaled_size to DCTSIZE,
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166 * and has computed unscaled downsampled_width and downsampled_height.
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169 #endif /* IDCT_SCALING_SUPPORTED */
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171 /* Report number of components in selected colorspace. */
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172 /* Probably this should be in the color conversion module... */
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173 switch (cinfo->out_color_space) {
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174 case JCS_GRAYSCALE:
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175 cinfo->out_color_components = 1;
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178 #if RGB_PIXELSIZE != 3
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179 cinfo->out_color_components = RGB_PIXELSIZE;
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181 #endif /* else share code with YCbCr */
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183 cinfo->out_color_components = 3;
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187 cinfo->out_color_components = 4;
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189 default: /* else must be same colorspace as in file */
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190 cinfo->out_color_components = cinfo->num_components;
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193 cinfo->output_components = (cinfo->quantize_colors ? 1 :
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194 cinfo->out_color_components);
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196 /* See if upsampler will want to emit more than one row at a time */
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197 if (use_merged_upsample(cinfo))
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198 cinfo->rec_outbuf_height = cinfo->max_v_samp_factor;
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200 cinfo->rec_outbuf_height = 1;
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205 * Several decompression processes need to range-limit values to the range
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206 * 0..MAXJSAMPLE; the input value may fall somewhat outside this range
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207 * due to noise introduced by quantization, roundoff error, etc. These
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208 * processes are inner loops and need to be as fast as possible. On most
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209 * machines, particularly CPUs with pipelines or instruction prefetch,
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210 * a (subscript-check-less) C table lookup
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211 * x = sample_range_limit[x];
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212 * is faster than explicit tests
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213 * if (x < 0) x = 0;
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214 * else if (x > MAXJSAMPLE) x = MAXJSAMPLE;
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215 * These processes all use a common table prepared by the routine below.
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217 * For most steps we can mathematically guarantee that the initial value
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218 * of x is within MAXJSAMPLE+1 of the legal range, so a table running from
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219 * -(MAXJSAMPLE+1) to 2*MAXJSAMPLE+1 is sufficient. But for the initial
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220 * limiting step (just after the IDCT), a wildly out-of-range value is
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221 * possible if the input data is corrupt. To avoid any chance of indexing
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222 * off the end of memory and getting a bad-pointer trap, we perform the
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223 * post-IDCT limiting thus:
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224 * x = range_limit[x & MASK];
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225 * where MASK is 2 bits wider than legal sample data, ie 10 bits for 8-bit
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226 * samples. Under normal circumstances this is more than enough range and
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227 * a correct output will be generated; with bogus input data the mask will
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228 * cause wraparound, and we will safely generate a bogus-but-in-range output.
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229 * For the post-IDCT step, we want to convert the data from signed to unsigned
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230 * representation by adding CENTERJSAMPLE at the same time that we limit it.
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231 * So the post-IDCT limiting table ends up looking like this:
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232 * CENTERJSAMPLE,CENTERJSAMPLE+1,...,MAXJSAMPLE,
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233 * MAXJSAMPLE (repeat 2*(MAXJSAMPLE+1)-CENTERJSAMPLE times),
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234 * 0 (repeat 2*(MAXJSAMPLE+1)-CENTERJSAMPLE times),
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235 * 0,1,...,CENTERJSAMPLE-1
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236 * Negative inputs select values from the upper half of the table after
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239 * We can save some space by overlapping the start of the post-IDCT table
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240 * with the simpler range limiting table. The post-IDCT table begins at
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241 * sample_range_limit + CENTERJSAMPLE.
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243 * Note that the table is allocated in near data space on PCs; it's small
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244 * enough and used often enough to justify this.
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248 prepare_range_limit_table (j_decompress_ptr cinfo)
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249 /* Allocate and fill in the sample_range_limit table */
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254 table = (JSAMPLE *)
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255 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
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256 (5 * (MAXJSAMPLE+1) + CENTERJSAMPLE) * SIZEOF(JSAMPLE));
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257 table += (MAXJSAMPLE+1); /* allow negative subscripts of simple table */
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258 cinfo->sample_range_limit = table;
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259 /* First segment of "simple" table: limit[x] = 0 for x < 0 */
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260 MEMZERO(table - (MAXJSAMPLE+1), (MAXJSAMPLE+1) * SIZEOF(JSAMPLE));
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261 /* Main part of "simple" table: limit[x] = x */
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262 for (i = 0; i <= MAXJSAMPLE; i++)
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263 table[i] = (JSAMPLE) i;
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264 table += CENTERJSAMPLE; /* Point to where post-IDCT table starts */
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265 /* End of simple table, rest of first half of post-IDCT table */
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266 for (i = CENTERJSAMPLE; i < 2*(MAXJSAMPLE+1); i++)
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267 table[i] = MAXJSAMPLE;
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268 /* Second half of post-IDCT table */
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269 MEMZERO(table + (2 * (MAXJSAMPLE+1)),
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270 (2 * (MAXJSAMPLE+1) - CENTERJSAMPLE) * SIZEOF(JSAMPLE));
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271 MEMCOPY(table + (4 * (MAXJSAMPLE+1) - CENTERJSAMPLE),
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272 cinfo->sample_range_limit, CENTERJSAMPLE * SIZEOF(JSAMPLE));
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277 * Master selection of decompression modules.
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278 * This is done once at jpeg_start_decompress time. We determine
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279 * which modules will be used and give them appropriate initialization calls.
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280 * We also initialize the decompressor input side to begin consuming data.
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282 * Since jpeg_read_header has finished, we know what is in the SOF
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283 * and (first) SOS markers. We also have all the application parameter
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288 master_selection (j_decompress_ptr cinfo)
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290 my_master_ptr master = (my_master_ptr) cinfo->master;
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291 boolean use_c_buffer;
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292 long samplesperrow;
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293 JDIMENSION jd_samplesperrow;
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295 /* Initialize dimensions and other stuff */
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296 jpeg_calc_output_dimensions(cinfo);
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297 prepare_range_limit_table(cinfo);
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299 /* Width of an output scanline must be representable as JDIMENSION. */
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300 samplesperrow = (long) cinfo->output_width * (long) cinfo->out_color_components;
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301 jd_samplesperrow = (JDIMENSION) samplesperrow;
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302 if ((long) jd_samplesperrow != samplesperrow)
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303 ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
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305 /* Initialize my private state */
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306 master->pass_number = 0;
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307 master->using_merged_upsample = use_merged_upsample(cinfo);
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309 /* Color quantizer selection */
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310 master->quantizer_1pass = NULL;
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311 master->quantizer_2pass = NULL;
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312 /* No mode changes if not using buffered-image mode. */
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313 if (! cinfo->quantize_colors || ! cinfo->buffered_image) {
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314 cinfo->enable_1pass_quant = FALSE;
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315 cinfo->enable_external_quant = FALSE;
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316 cinfo->enable_2pass_quant = FALSE;
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318 if (cinfo->quantize_colors) {
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319 if (cinfo->raw_data_out)
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320 ERREXIT(cinfo, JERR_NOTIMPL);
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321 /* 2-pass quantizer only works in 3-component color space. */
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322 if (cinfo->out_color_components != 3) {
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323 cinfo->enable_1pass_quant = TRUE;
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324 cinfo->enable_external_quant = FALSE;
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325 cinfo->enable_2pass_quant = FALSE;
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326 cinfo->colormap = NULL;
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327 } else if (cinfo->colormap != NULL) {
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328 cinfo->enable_external_quant = TRUE;
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329 } else if (cinfo->two_pass_quantize) {
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330 cinfo->enable_2pass_quant = TRUE;
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332 cinfo->enable_1pass_quant = TRUE;
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335 if (cinfo->enable_1pass_quant) {
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336 #ifdef QUANT_1PASS_SUPPORTED
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337 jinit_1pass_quantizer(cinfo);
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338 master->quantizer_1pass = cinfo->cquantize;
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340 ERREXIT(cinfo, JERR_NOT_COMPILED);
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344 /* We use the 2-pass code to map to external colormaps. */
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345 if (cinfo->enable_2pass_quant || cinfo->enable_external_quant) {
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346 #ifdef QUANT_2PASS_SUPPORTED
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347 jinit_2pass_quantizer(cinfo);
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348 master->quantizer_2pass = cinfo->cquantize;
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350 ERREXIT(cinfo, JERR_NOT_COMPILED);
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353 /* If both quantizers are initialized, the 2-pass one is left active;
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354 * this is necessary for starting with quantization to an external map.
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358 /* Post-processing: in particular, color conversion first */
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359 if (! cinfo->raw_data_out) {
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360 if (master->using_merged_upsample) {
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361 #ifdef UPSAMPLE_MERGING_SUPPORTED
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362 jinit_merged_upsampler(cinfo); /* does color conversion too */
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364 ERREXIT(cinfo, JERR_NOT_COMPILED);
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367 jinit_color_deconverter(cinfo);
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368 jinit_upsampler(cinfo);
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370 jinit_d_post_controller(cinfo, cinfo->enable_2pass_quant);
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373 jinit_inverse_dct(cinfo);
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374 /* Entropy decoding: either Huffman or arithmetic coding. */
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375 if (cinfo->arith_code) {
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376 ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
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378 if (cinfo->progressive_mode) {
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379 #ifdef D_PROGRESSIVE_SUPPORTED
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380 jinit_phuff_decoder(cinfo);
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382 ERREXIT(cinfo, JERR_NO_PROGRESSIVE);
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385 jinit_huff_decoder(cinfo);
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388 /* Initialize principal buffer controllers. */
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389 use_c_buffer = cinfo->inputctl->has_multiple_scans || cinfo->buffered_image;
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390 jinit_d_coef_controller(cinfo, use_c_buffer);
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392 if (! cinfo->raw_data_out)
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393 jinit_d_main_controller(cinfo, FALSE /* never need full buffer here */);
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395 /* We can now tell the memory manager to allocate virtual arrays. */
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396 (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
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398 /* Initialize input side of decompressor to consume first scan. */
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399 (*cinfo->inputctl->start_input_pass) (cinfo);
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401 #ifdef D_MULTISCAN_FILES_SUPPORTED
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402 /* If jpeg_start_decompress will read the whole file, initialize
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403 * progress monitoring appropriately. The input step is counted
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406 if (cinfo->progress != NULL && ! cinfo->buffered_image &&
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407 cinfo->inputctl->has_multiple_scans) {
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409 /* Estimate number of scans to set pass_limit. */
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410 if (cinfo->progressive_mode) {
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411 /* Arbitrarily estimate 2 interleaved DC scans + 3 AC scans/component. */
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412 nscans = 2 + 3 * cinfo->num_components;
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414 /* For a nonprogressive multiscan file, estimate 1 scan per component. */
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415 nscans = cinfo->num_components;
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417 cinfo->progress->pass_counter = 0L;
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418 cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows * nscans;
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419 cinfo->progress->completed_passes = 0;
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420 cinfo->progress->total_passes = (cinfo->enable_2pass_quant ? 3 : 2);
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421 /* Count the input pass as done */
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422 master->pass_number++;
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424 #endif /* D_MULTISCAN_FILES_SUPPORTED */
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430 * This is called at the beginning of each output pass. We determine which
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431 * modules will be active during this pass and give them appropriate
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432 * start_pass calls. We also set is_dummy_pass to indicate whether this
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433 * is a "real" output pass or a dummy pass for color quantization.
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434 * (In the latter case, jdapi.c will crank the pass to completion.)
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438 prepare_for_output_pass (j_decompress_ptr cinfo)
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440 my_master_ptr master = (my_master_ptr) cinfo->master;
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442 if (master->pub.is_dummy_pass) {
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443 #ifdef QUANT_2PASS_SUPPORTED
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444 /* Final pass of 2-pass quantization */
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445 master->pub.is_dummy_pass = FALSE;
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446 (*cinfo->cquantize->start_pass) (cinfo, FALSE);
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447 (*cinfo->post->start_pass) (cinfo, JBUF_CRANK_DEST);
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448 (*cinfo->main->start_pass) (cinfo, JBUF_CRANK_DEST);
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450 ERREXIT(cinfo, JERR_NOT_COMPILED);
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451 #endif /* QUANT_2PASS_SUPPORTED */
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453 if (cinfo->quantize_colors && cinfo->colormap == NULL) {
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454 /* Select new quantization method */
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455 if (cinfo->two_pass_quantize && cinfo->enable_2pass_quant) {
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456 cinfo->cquantize = master->quantizer_2pass;
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457 master->pub.is_dummy_pass = TRUE;
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458 } else if (cinfo->enable_1pass_quant) {
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459 cinfo->cquantize = master->quantizer_1pass;
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461 ERREXIT(cinfo, JERR_MODE_CHANGE);
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464 (*cinfo->idct->start_pass) (cinfo);
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465 (*cinfo->coef->start_output_pass) (cinfo);
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466 if (! cinfo->raw_data_out) {
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467 if (! master->using_merged_upsample)
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468 (*cinfo->cconvert->start_pass) (cinfo);
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469 (*cinfo->upsample->start_pass) (cinfo);
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470 if (cinfo->quantize_colors)
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471 (*cinfo->cquantize->start_pass) (cinfo, master->pub.is_dummy_pass);
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472 (*cinfo->post->start_pass) (cinfo,
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473 (master->pub.is_dummy_pass ? JBUF_SAVE_AND_PASS : JBUF_PASS_THRU));
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474 (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU);
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478 /* Set up progress monitor's pass info if present */
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479 if (cinfo->progress != NULL) {
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480 cinfo->progress->completed_passes = master->pass_number;
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481 cinfo->progress->total_passes = master->pass_number +
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482 (master->pub.is_dummy_pass ? 2 : 1);
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483 /* In buffered-image mode, we assume one more output pass if EOI not
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484 * yet reached, but no more passes if EOI has been reached.
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486 if (cinfo->buffered_image && ! cinfo->inputctl->eoi_reached) {
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487 cinfo->progress->total_passes += (cinfo->enable_2pass_quant ? 2 : 1);
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494 * Finish up at end of an output pass.
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498 finish_output_pass (j_decompress_ptr cinfo)
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500 my_master_ptr master = (my_master_ptr) cinfo->master;
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502 if (cinfo->quantize_colors)
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503 (*cinfo->cquantize->finish_pass) (cinfo);
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504 master->pass_number++;
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508 #ifdef D_MULTISCAN_FILES_SUPPORTED
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511 * Switch to a new external colormap between output passes.
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515 jpeg_new_colormap (j_decompress_ptr cinfo)
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517 my_master_ptr master = (my_master_ptr) cinfo->master;
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519 /* Prevent application from calling me at wrong times */
\r
520 if (cinfo->global_state != DSTATE_BUFIMAGE)
\r
521 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
\r
523 if (cinfo->quantize_colors && cinfo->enable_external_quant &&
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524 cinfo->colormap != NULL) {
\r
525 /* Select 2-pass quantizer for external colormap use */
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526 cinfo->cquantize = master->quantizer_2pass;
\r
527 /* Notify quantizer of colormap change */
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528 (*cinfo->cquantize->new_color_map) (cinfo);
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529 master->pub.is_dummy_pass = FALSE; /* just in case */
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531 ERREXIT(cinfo, JERR_MODE_CHANGE);
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534 #endif /* D_MULTISCAN_FILES_SUPPORTED */
\r
538 * Initialize master decompression control and select active modules.
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539 * This is performed at the start of jpeg_start_decompress.
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543 jinit_master_decompress (j_decompress_ptr cinfo)
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545 my_master_ptr master;
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547 master = (my_master_ptr)
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548 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
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549 SIZEOF(my_decomp_master));
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550 cinfo->master = (struct jpeg_decomp_master *) master;
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551 master->pub.prepare_for_output_pass = prepare_for_output_pass;
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552 master->pub.finish_output_pass = finish_output_pass;
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554 master->pub.is_dummy_pass = FALSE;
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556 master_selection(cinfo);
\r